I have a 2014 A6 S-Line. When I'm using bluetooth audio from my iPhone 5, I get stuttering and caching delays/catchups. I'm not positive but I think this may somehow be connected to having poor phone signal (although I know there is no link between bluetooth and GPRS/3G) but it seems to happen if I lose my phone signal.
Does anyone know of a cure?
My previous Merc C220 worked flawlessly.

 

May be a pointless question, but is your iPhone up to date with the current iOS?

 

Yes. Up to date at IOS 7.1.1, but this may not always be a good thing :-)

 

Had that happen with my Droid too. Almost like it paused for a sec and then started again. I did a factory reset my phone and it never happened again.